wire met failure in the process of using, so what is the cause of wire fault? You know about this problem with usb cable manufacturer.

( 1) When shake test cable core insulation resistance or several core over the ground, or between the core and core insulation resistance less than 100 Ω, for low resistance grounding or short circuit fault.

( 2) When shake test cable core insulation resistance or several core over the ground, or between the core and core insulation resistance is lower than normal, but higher than 100 Ω, for high resistance grounding fault.

( 3) When a wave measuring cable core or several core over the ground or normal, high insulation resistance should be conductor continuity test, check whether there is a disconnect, if any is the break line fault.

( 4) When shake test cable is a core or several core conductor of discontinuity, and the resistance grounding, as the bolt and ground fault.

( 5) Pressure test, flashover fault happens at preventive location mostly in the middle of the cable terminals and connectors. Flashover occurred many times continuously, sometimes every few seconds to a few minutes.